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Crestron SIMPL+
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Examine an example using the switch-case construct. Perhaps there is a variable that
should hold the number of days in the current month. The following example uses
switch-case to set the value of this variable.
switch (getMonthNum())
{
case (2): //February
{
if (leapYear) // this variable was set elsewhere
numdays = 29;
else
numdays = 28;
}
case (4): // April
numdays = 30;
case (6): // June
numdays = 30;
case (9): // September
numdays = 30;
case (11): // November
numdays = 30;
default: // Any other month
numdays = 31;
}
Notice that curly braces did not enclose many of the statements in the previous
example. For most SIMPL+ constructs, the braces are only needed when more than
one statement is to be grouped together. If the program has only a single statement
following the case keyword, then the braces are optional.
Controlling Program Flow: Loops
“Controlling Program Flow: Branching” (on page 24) discussed constructs for
controlling the flow of a program by making decisions and branching. Sometimes a
program should execute the same code a number of times. This is called looping.
SIMPL+ provides three looping constructs: the for loop, the while loop, and the do-
until loop.
for Loops
The for loop is useful to cause a section of code to execute a specific number of
times. For example, consider clearing each element of a 15-element string array (set
it to an empty string). Use a for loop set to run 15 times and clear one element each
time through the loop.
Control the number of loops a for loop executes through the use of an index variable,
which must be an integer variable previously declared in the variable declaration
section of the program. Specify the starting and ending values for the index variable,
and an optional step value (how much the variable increments by each time through
the loop). Inside the loop, the executing code can reference this index.
The syntax of the for loop is as follows.
for (<variable> = <start> to <end> step <stepValue>)
{
// code in here executes each time through the loop
}
Programming Guide – DOC. 5789A SIMPL+
• 27
- Crestron SIMPL+ 1
- Software 1
- Programming Guide 1
- Contents 3
- Software Crestron SIMPL+ 4
- Introduction 5
- Quick Start 6
- Making it Work 8
- Compiler Directives 9
- Software Crestron SIMPL+ 10
- Software 11
- Include Libraries 11
- Variable Declarations 12
- User-Defined Functions 14
- Event Functions 14
- Function Main 16
- Input/Output Types 17
- All About Variables 20
- Operators 26
- Expressions 27
- Statements 28
- Using System Functions 34
- User Defined Functions 35
- Function Definitions 36
- Functions That Return Values 40
- Function Libraries 42
- Compact Flash Functions 43
- Reading and Writing Data 44
- Working with Time 46
- Wait Events 47
- Working with Strings 49
- Removing Data From Buffers 51
- Forcing a Task Switch 53
- Debugging 54
- Debugging with Print() 55
- Software License Agreement 56
- Return and Warranty Policies 58
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